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dtb 2022-05-01 00:16:17 -04:00
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homepage/knowledge/linux.html
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<SCRIPT SRC="/js/sheets.js" TYPE="application/javascript"></SCRIPT>
<SCRIPT TYPE="application/javascript">window.onload = window.initializesheets;</SCRIPT>
<H1>linux</H1>
<H3>updated 2022-04-30</H3>
<H3>updated 2022-05-01</H3>
<HR ALIGN="left" SIZE="1" WIDTH="25%" />
<H2>ACPI client</H2>
<P>
@ -144,19 +144,21 @@ Use <CODE>mkfs(8)</CODE> for creating filesystems and <CODE>mount(8)</CODE> for
<CODE>e2fsprogs</CODE> is needed for the <CODE>dm_mod</CODE> kernel module used for LUKS partition decryption.
</P>
<P>
To format a partition for LUKS, determine the physical block device location for that partition and run <CODE>cryptsetup luksFormat [<I>partition</I>]</CODE>.
To format a partition to a LUKS volume, determine the physical block device location for that partition and run <CODE>cryptsetup luksFormat [<I>partition</I>]</CODE>.
The passphrase used can be changed or removed after creation.
</P>
<P>
To open a LUKS partition, use <CODE>cryptsetup luksOpen [<I>partition</I>] [<I>name</I>]</CODE>.
To open a LUKS volume, use <CODE>cryptsetup luksOpen [<I>partition</I>] [<I>name</I>]</CODE>.
This <I>name</I> is the name the <I>decrypted block device</I> location will take in <CODE>/dev/mapper/</CODE>.
Before the decrypted block device has a filesystem it'll just be cleared space - use <CODE>mkfs.[<I>filesystem</I>] /dev/mapper/[<I>name</I>]</CODE>.
</P>
<P>
To mount an opened LUKS partition, use <CODE>mount(8)</CODE> as normal, just with the decrypted block device location.
Before the decrypted block device has a filesystem it'll just be cleared space - format as normal but use the decrypted block device location.
</P>
<P>
To close an open LUKS partition, <CODE>umount(8)</CODE> it if it's open and <CODE>cryptsetup luksClose [<I>name</I>]</CODE>.
To mount a partition in an opened LUKS volume, use <CODE>mount(8)</CODE> as normal, just with the decrypted block device location.
</P>
<P>
To close an open LUKS volume, <CODE>umount(8)</CODE> any mapped and mounted partitions from the volume and <CODE>cryptsetup luksClose [<I>name</I>]</CODE>.
</P>
<P>
To make the LUKS partition openable via keyfile, first make a keyfile (<CODE>dd if=/dev/urandom of=/root/keyfile bs=1024 count=4</CODE> seems to work), and optionally make it readable by root only (<CODE>chmod 0400 [<I>keyfile</I>]</CODE>).